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1 office 1 # Configure a more-standard replacement for <time.h>.
2  
3 # Copyright (C) 2000-2001, 2003-2007, 2009-2016 Free Software Foundation, Inc.
4  
5 # serial 9
6  
7 # This file is free software; the Free Software Foundation
8 # gives unlimited permission to copy and/or distribute it,
9 # with or without modifications, as long as this notice is preserved.
10  
11 # Written by Paul Eggert and Jim Meyering.
12  
13 AC_DEFUN([gl_HEADER_TIME_H],
14 [
15 dnl Use AC_REQUIRE here, so that the default behavior below is expanded
16 dnl once only, before all statements that occur in other macros.
17 AC_REQUIRE([gl_HEADER_TIME_H_BODY])
18 ])
19  
20 AC_DEFUN([gl_HEADER_TIME_H_BODY],
21 [
22 AC_REQUIRE([AC_C_RESTRICT])
23 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
24 gl_NEXT_HEADERS([time.h])
25 AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
26 ])
27  
28 dnl Check whether 'struct timespec' is declared
29 dnl in time.h, sys/time.h, pthread.h, or unistd.h.
30  
31 AC_DEFUN([gl_CHECK_TYPE_STRUCT_TIMESPEC],
32 [
33 AC_CHECK_HEADERS_ONCE([sys/time.h])
34 AC_CACHE_CHECK([for struct timespec in <time.h>],
35 [gl_cv_sys_struct_timespec_in_time_h],
36 [AC_COMPILE_IFELSE(
37 [AC_LANG_PROGRAM(
38 [[#include <time.h>
39 ]],
40 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
41 [gl_cv_sys_struct_timespec_in_time_h=yes],
42 [gl_cv_sys_struct_timespec_in_time_h=no])])
43  
44 TIME_H_DEFINES_STRUCT_TIMESPEC=0
45 SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=0
46 PTHREAD_H_DEFINES_STRUCT_TIMESPEC=0
47 UNISTD_H_DEFINES_STRUCT_TIMESPEC=0
48 if test $gl_cv_sys_struct_timespec_in_time_h = yes; then
49 TIME_H_DEFINES_STRUCT_TIMESPEC=1
50 else
51 AC_CACHE_CHECK([for struct timespec in <sys/time.h>],
52 [gl_cv_sys_struct_timespec_in_sys_time_h],
53 [AC_COMPILE_IFELSE(
54 [AC_LANG_PROGRAM(
55 [[#include <sys/time.h>
56 ]],
57 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
58 [gl_cv_sys_struct_timespec_in_sys_time_h=yes],
59 [gl_cv_sys_struct_timespec_in_sys_time_h=no])])
60 if test $gl_cv_sys_struct_timespec_in_sys_time_h = yes; then
61 SYS_TIME_H_DEFINES_STRUCT_TIMESPEC=1
62 else
63 AC_CACHE_CHECK([for struct timespec in <pthread.h>],
64 [gl_cv_sys_struct_timespec_in_pthread_h],
65 [AC_COMPILE_IFELSE(
66 [AC_LANG_PROGRAM(
67 [[#include <pthread.h>
68 ]],
69 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
70 [gl_cv_sys_struct_timespec_in_pthread_h=yes],
71 [gl_cv_sys_struct_timespec_in_pthread_h=no])])
72 if test $gl_cv_sys_struct_timespec_in_pthread_h = yes; then
73 PTHREAD_H_DEFINES_STRUCT_TIMESPEC=1
74 else
75 AC_CACHE_CHECK([for struct timespec in <unistd.h>],
76 [gl_cv_sys_struct_timespec_in_unistd_h],
77 [AC_COMPILE_IFELSE(
78 [AC_LANG_PROGRAM(
79 [[#include <unistd.h>
80 ]],
81 [[static struct timespec x; x.tv_sec = x.tv_nsec;]])],
82 [gl_cv_sys_struct_timespec_in_unistd_h=yes],
83 [gl_cv_sys_struct_timespec_in_unistd_h=no])])
84 if test $gl_cv_sys_struct_timespec_in_unistd_h = yes; then
85 UNISTD_H_DEFINES_STRUCT_TIMESPEC=1
86 fi
87 fi
88 fi
89 fi
90 AC_SUBST([TIME_H_DEFINES_STRUCT_TIMESPEC])
91 AC_SUBST([SYS_TIME_H_DEFINES_STRUCT_TIMESPEC])
92 AC_SUBST([PTHREAD_H_DEFINES_STRUCT_TIMESPEC])
93 AC_SUBST([UNISTD_H_DEFINES_STRUCT_TIMESPEC])
94 ])
95  
96 AC_DEFUN([gl_TIME_MODULE_INDICATOR],
97 [
98 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
99 AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
100 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
101 dnl Define it also as a C macro, for the benefit of the unit tests.
102 gl_MODULE_INDICATOR_FOR_TESTS([$1])
103 ])
104  
105 AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
106 [
107 GNULIB_MKTIME=0; AC_SUBST([GNULIB_MKTIME])
108 GNULIB_NANOSLEEP=0; AC_SUBST([GNULIB_NANOSLEEP])
109 GNULIB_STRPTIME=0; AC_SUBST([GNULIB_STRPTIME])
110 GNULIB_TIMEGM=0; AC_SUBST([GNULIB_TIMEGM])
111 GNULIB_TIME_R=0; AC_SUBST([GNULIB_TIME_R])
112 GNULIB_TIME_RZ=0; AC_SUBST([GNULIB_TIME_RZ])
113 dnl Assume proper GNU behavior unless another module says otherwise.
114 HAVE_DECL_LOCALTIME_R=1; AC_SUBST([HAVE_DECL_LOCALTIME_R])
115 HAVE_NANOSLEEP=1; AC_SUBST([HAVE_NANOSLEEP])
116 HAVE_STRPTIME=1; AC_SUBST([HAVE_STRPTIME])
117 HAVE_TIMEGM=1; AC_SUBST([HAVE_TIMEGM])
118 dnl If another module says to replace or to not replace, do that.
119 dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
120 dnl this lets maintainers check for portability.
121 REPLACE_LOCALTIME_R=GNULIB_PORTCHECK; AC_SUBST([REPLACE_LOCALTIME_R])
122 REPLACE_MKTIME=GNULIB_PORTCHECK; AC_SUBST([REPLACE_MKTIME])
123 REPLACE_NANOSLEEP=GNULIB_PORTCHECK; AC_SUBST([REPLACE_NANOSLEEP])
124 REPLACE_TIMEGM=GNULIB_PORTCHECK; AC_SUBST([REPLACE_TIMEGM])
125  
126 dnl Hack so that the time module doesn't depend on the sys_time module.
127 dnl First, default GNULIB_GETTIMEOFDAY to 0 if sys_time is absent.
128 : ${GNULIB_GETTIMEOFDAY=0}; AC_SUBST([GNULIB_GETTIMEOFDAY])
129 dnl Second, it's OK to not use GNULIB_PORTCHECK for REPLACE_GMTIME
130 dnl and REPLACE_LOCALTIME, as portability to Solaris 2.6 and earlier
131 dnl is no longer a big deal.
132 REPLACE_GMTIME=0; AC_SUBST([REPLACE_GMTIME])
133 REPLACE_LOCALTIME=0; AC_SUBST([REPLACE_LOCALTIME])
134 ])